External adjustment for hydraulic pump bearings



Nov. 19, 1935. w. ERNST EXTERNAL ADJUSTMENT `FOR HYDRAULIC PUMP BEARINGS 'Filed Aug. 1e. 1934 mm r JM. ww NNN Patented Nov. 19,v 1935 PATENT OFFICE EXTERNAL ADJUSTMENT Fon HYDRAULIC Pmur BEAnmGs Walter Ernst,

Mount Gilead, Ohio', lassignor to The Hydraulic Press Manufacturing Company, Mount Gilead, Ohio, a corporation of Ohio Application August 16, 1934, serial No. 140,131; 1

vSiC'laimil.

This invention relates to hydraulic pumps or motors and, in particular, to the adjustment of the bearings on such pumps or motors as are rotatably supported upon pintles.

One object of my invention is toprovide an adjustment for taking up the play in the bearings of` a hydraulic pump or motor, this adjustment being effected at a point outside the motor.

Another object is to provide an external adjustment device for the tapered roller bearings upon which the cylinder barrel of a hydraulic pump or motor is rotatably supported with respect to the pintle. l

Another object is to provide an adjustment for the tapered roller bearings upon which the cylinder barrel of such a pump or motor is rotatably supported, this adjustment being eiected by moving the external end of the pintle around Y which the cylinder barrel rotates.

Another object is to provide such an adjustment wherein the motion of the pintle is eilected by means of micrometer screw. action, enabling the looseness of the bearings to be adjusted to a `very accurate degree.

Another object is to provide locking means for locking the pintle and the bearings in their adjusted positions.

-In the drawing:

The gur'e isl a central vertical section through a hydraulic pump or motor containing the bearingv adjustment device of my invention.

Referring tothe drawing in detail. the gure shows a hydraulic pump or motor of the rotary' type, and having a cylindrical casing I provided with end plates 2 and 3. The end plate 3 is provided with a boss 4 having a bore 5 adapted to receive the large end 6 of a pintle 1, upon the smaller end 8 of -which the moving parts ofthe pump rotate. Boss 4 is also provided with ports 9 and I0 to provide inlet and outlet passages for the iiuid utilized by the pump or motor. The large portion 6 of the pintle or fluid distributing valve' 1 is slidably mounted in the bore 5, and is provided with a threaded portion II at its outer end. 'Ihis threaded portion II is engaged by the threaded nut I2 having the slit locking portions I3 and I4 which are forced toward or away from one another by means of the locking screw I5 threaded therethrough. 'Ihese parts are protected by the end cap I6 held against the boss 4 by the screws I1. A

On the pintle portion 8 the cylinder barrel 20 is rotatably supported, through the intermediate agency of the tapered rollerbearings 2| having their inner races 22 mounted upon the pintle portion 8. v The outer races 23 thereof are mounted in bores 24 in the cylinder barrel, and are held in place by the retaining members'25 and 26 respectively. The-retaining ring 25 is held in place by the screws 21, whereas the re- 5 taining portion- 26 is similarly attached to the cylinder barrel by means of the screws 21.

The retaining portion 26 `is provided with a drive shaft portion 21 'which isgsupported by the anti-friction bearings 28 and 29 to enable it to l0 be rotatably mounted inv the bore 38 of the end plate 2. 'I'he drive shaft portion 21 is provided with threads 3| which are engaged by the threaded lock ring 32. ured to the pump in place by its screws 34. Between the retaining ring 33 and the threaded lock ring 32, and sey cured by a pressed t in the former, is the oil seal ring 33a. The latter serves to prevent the leakage of oil from the interior of the pump by 20 way of the bearings 28-29. l l

The cylinder barrel 28 is provided withl radial cylinder bores 35, within which the pistons I3Ii are reciprocably mounted. These are'provided with cross heads 31 adapted to reciprocate tan- 25 ge'ntially in the slots 38 of the guide blocks 39. The latter are clamped between the ,secondary rotor halves 40, these rotor halves being rotatably supportedupon the tapered roller bearings 4I, the inner races 42 of which are mounted upon 30 the secondary rotor halves 40 themselves, whereas the' outer races 43 are supported in the shifter ring 44. The races 42 and.V 43 are held in position by theretaining rings 45 and 46 respectively, through the agency of 'I'he shifter ring 44 isgprovided with means for shifting it. to and fro, thereby varying the axis of rotation of the secondary rotor halves 40 with reference to the axis of rotation of rthe cylinder barrel 28. This eccentricity of axes causes the pistons 36 to reciprocate in the cylinder bores 35, in a manner well .understood by those skilled in the art. The pintle 1 isprovided with longitudinal bores (not shown), forming means of communication between the external ports 9 and 45 I the screws 41 and 48. 35:

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tapered roller bearing abuts the ring 53 loosely mounted on the pintle portion 8.. The ring 53 abuts the shoulder 54 between the pintle portions 6 and 8 aswell as the inner surface 51 of the inwardly-projecting portion 58 of the end plate 3. The bore 55 in the cylinder barrel 20 is made of' such dimensions relative to the outside dimensions of the pintle portion 8 that a very slight clearance exists between them. The annular passages 56 are provided for the relief of the fluid escaping from the cylinder bores 35 or pintle cutouts 49 and 50, and to prevent an unequal moment of forces tending to warp the pintle.

In the operation of my invention, the tapered roller bearings 2I are adjusted by removing the cap I 6 by taking out the screws I1. The lock screw I5 is Vthen loosened, permitting the adjusting nut I2 to be turned.

If the bearings 2I are unnecessarily loose, and it is desired to tighten them, the lock nut I2 is turned in a clockwise direction so that the pintle l is drawn tothe left. retaining plate 5I to push the tapered inner race 22 of the righthand tapered roller bearing 2| inward; and the -inner race 22 is prevented from moving inward by the ring 53 abutting the inner face 58 of the end plate 3. Consequently, this results in the tapered roller bearings 2| being tightenedby reason of their tapered races 22 and 23 being forced toward one another. The bearings may be tightened until they bind slightly or until they reach the necessary amount of tightness, after which the adjusting nut I2 is locked in position by turning the lock screw I5.

By reversing the direction of rotation of the lock nut I2, it is obviously possible to loosen the bearings if they happen to be too tight in their adjustment. It will be observed that the operation of tightening or loosening the bearings can be conducted without dismantling the pump or motor, kand accordingly the cylinder barrel 2U may be necessary to adapt it to varying conditions anduses.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:A

1. A fluid pressure pump or motor including aV casing forming a chamber, a cylinder body within the chamber having cylinders with pistons reciprocable therein, means for reciprocating said pistons, an axially movable fluid distributing valve, said cylinder body and said fluid distributing valve being mounted for rotation relatively to one another, adjustable anti-friction bearing assemblies mounted between said cylinder body and said fluid distributing valve, means responsive to the axial motion of said fluid distributing valve to adjust-the diametral clearances of said bearing assemblies, a portion of said fluid distributing valve extending outside said chamber, and means on said external portion for axially moving said fluid distributingy valve to adjust said diametral clearances.

2. A fluid pressure pump or motor including a casing forming a chamber, a cylinder Abody within the chamber having cylinders with pistons This action causes the tributing valve being mounted for rotation relatively to one another, adjustable anti-friction bearing assemblies mounted between said cylinder body and said fluid distributing valve. means responsive to the axial motion of said fluid dis- 5 tributing valve to adjust the diametral clearances 0f said bearing assemblies, said adjusting means comprising a contacting portion on said iluid distributing valve arranged to engage one of said bearing assemblies and a stationary member co- 1g operating therewith to engage the other bearing assembly so as to urge said bearing assemblies toward one another in response to the axial motion of said fluid distributing valve, a portion of said fluid distributing valve extend- 15 ing outside said chamber, and means on said external portion for axially moving said fluid distributing valve to adjust said diametral clearances.

3. A fluid pressure pump or motor including 20 a casing forming a chamber, a cylinder body within the chamber having cylinders with pistons reciprocable therein, a secondary rotor mounted for rotation upon an axis independent of said cylinder body and arranged to engage 25 said pistons to impart reciprocation thereto, an axially movable fluid distributing valve, said cylinder body and said fluid distributing valve being mounted for rotation relatively to one another, adjustable'antifriotion bearing assemblies mount- 3u ed between said cylinder body and said fluid distributing valve, means responsive to the axial motion of said fluid distributing valve to adjust the diametral clearances of said bearing assemblies, a portionr of said fluid distributing valve 35 extending outside said chamber, and means on said external portion for axially moving said fluid distributing valve to adjust said diametral clearances.

4. A fluid pressure pump or motor including a 40 casing forming a chamber, a cylinder body within the chamber having cylinders with pistons reciprocable therein, means for reciprocating said pistons, an axially movable fluid distributing Valve, said cylinder body and said fluid distribut- 45 ing valve being mounted for rotation relatively to one another, a pair of spaced antifriction bearing assemblies mounted between said cylinder body and said fluid distributing valve, each of said bearing assemblies having relatively mov- 50 able races, means responsive to the axial motion of said fluid distributing valve to move said races relatively to Aone another to adjust the diametral clearances of said bearing assemblies, said fluid distributing valve extending outside said 55 chamber, and means on said external portion `forA axially moving said fluid distributing valve to adjust said diametral clearances.

5. A fluid pressure pump or motor including a casing forming a chamber, av cylinder body vwithin 00 the chamber' having cylinders with pistons reciprocable therein, means for reciprocating said pistons, an axially movable fluid distributing valve, said cylinder body and said fluid distributing valve being mounted for rotation relatively 65 to one another, spaced tapered roller bearing assemblies mounted between said cylinder body and said fluid distributing valve, each of said bearing assemblies having relatively movable races. means responsive to the axial motion of said fluid dis- 70 tributing valve to move said races relatively to one another to adjust the diametral clearances of said bearing' assemblies, a portion of said fluid distributing valve extending outside said chamber, and means on said external portion for axi- 15 allyl moving-said iiuid distributing valve to adjust said diametral clearances.

6. A iiuid pressure pump or motor including a casing forming a chamber, a, cylinder body within the chamber having cylinders with pistons reciprocable therein, means for reciprocating said pistons, an axially movable fluid ,distributing valve, said cylinder body and said uid distribut-I ametral clearances of said bearing as'semb1ies,`a portion of said fluid distributing valve extendingoutside said chamber, and means on said external portion for axially moving said fluid distributing valve to adjust said diametral clearances by moving. said races.

7. A iluid pressure pump or motor including a casing forming Aa. chamber, a cylinder body within the chamber having cylinders with pistons reeiprocable therein, means for reciprocatingsaid pistons, an axially movable fluid distributing valve, said cylinder body and said iluid distributing valve being mounted for rotation relatively to one another, spaced tapered roller bearing assemblies mounted between said cylinder body and said iluid distributing valve, each of said bearing assemblies having relatively movable races, means movable with said iluid distributing` valve to engage a race of one of said bearing'assemblies and a relatively stationary member arranged to cooperate with said movable means to engage a race of the other bearing assembly so as to urge the races of said bearing assemblies toward one another in response to the axial motion of said iluid distributing valve, a portion of said fluid distributing valve extendingy outside said chamber, and means on said externall portion for axially moving said fluid distributingl valve to adjust `said bearing assemblies 3 the diametral clearances of said tapered roller bearing assemblies.

8. A fluid pressure pump or motor including a casing forming a chamber, a cylinder body within the chamber having cylinders with pistons re- 5 ciprocable therein, means vfor reciprocating said pistons, v an axiallyk movable kfluid distributing valvegsaid cylinder body and said fluid distributing valve being mounted for rotation relatively to one another, a pair oi spaced anti-friction 10 bearing assemblies mounted between said cylinder body and said fluid distributing valve, each of having relatively movable races, a portion of said fluid distributing valve adapted to engage one race of one of said 15 bearing assemblies, a loosely mounted member on said nuid distributing valve adapted to engage the corresponding race ofthe other bearing assembly, said uid 'distributing valve extending outside said chamber, and means on said external 20 portion for axially moving said iluid distributing valve to alter the spacing between said valve end portion and said loosely .mounted member,

j whereby to adjust the diametral clearances of said bearing assemblies.

, 9. A uid pressure pump'ormotor including a casing forming a chamber, `a cylinder bod'y within the chamber having cylinders with pistons reciprocable therein, means for reciprocating said pistons, an axially movable uid distributing 30 valve, said cylinder'body and said uid distributing valve being mounted for rotation relatively to one. another, a pair of spaced anti-friction bearing `assemblies mounted between said cyl inder body and said fluiddistributing valve, each 35 `of said bearing assemblies having relatively movable races, a projecting member on said iluid distributing valve adapted to engage one race of one of saidbearing assemblies, la sliding ring on said fluid distributing valveadapted to engage 4o' said casing and the `corresponding race of the Vother bearing "assembly, a portion of said iluid distributing valve extending outside said chamber, and means on` said' xternal portion for axially moving said iluiddistributing valve to alter 45 the spacing between saidprojecting member and said' sliding ring', whereby to adjust thefdiametral clearances of said bearing assemblies.

, f AWAL'lliiill. ERNST. 

